这是在web.config中配置身份验证的方式：
<authentication mode="Forms">
<forms loginUrl="~/Account/Sigin"
name="MYCAUTH"
timeout="3000" />
</authentication>
如何使CookieMYCAUTH和ASP.NET_SessionIdCookie都过期？
试试这个：
DateTime expireDate = DateTime.Now.AddDays(30);
FormsAuthenticationTicket ticket = new FormsAuthenticationTicket(1, userName, DateTime.Now, expireDate, true, string.Empty);
string encryptedTicket = FormsAuthentication.Encrypt(ticket);
HttpCookie authenticationCookie = new HttpCookie(FormsAuthentication.FormsCookieName, encryptedTicket);
authenticationCookie.Expires = ticket.Expiration;
Response.Cookies.Add(authenticationCookie);
FormsAuthentication.SetAuthCookie(userName, true);
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我来说两句